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Define pseudohalogens with examples....

Define pseudohalogens with examples.

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The ions that contain two or several negative groups out of which one is nitrogen and shows the characteristic of halide ions are called pseudohalide ions. e.g. `CN^(-), OCN^(-)`
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ARIHANT PUBLICATION-GROUP 17 ELEMENTS : HALOGEN FAMILY-QUESTIONS FOR PRACTICE (Very Short Answer Type Questions)
  1. Which halogen shows only one oxidation number in its compounds ?

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  2. Define pseudohalogens with examples.

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  3. Which halogen does not exhibit the oxidation state of +1?

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  4. Which of the following elements does not show positive oxidation state...

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  5. Which hydracid of halogen has the highest bond energy?

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  6. Acidic character increases from HF to HI Account for this.

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  7. Concentrated hydrogen fluoride exists in the molecular formula of .......

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  8. Arrange the following in order of increasing size: Cl, Cl^+ , Cl^-

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  9. F(2) has lower bond dissociation enthalpy than Cl(2). Why?

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  10. Explain why halogens are strong oxidising agents.

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  11. SnCl(4) is more covalent than SnCl(2).

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  12. What is the oxidation number of oxygen in OF(2)?

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  13. Give two examples to show the anomalous behaviour of fluorine.

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  14. Why hydrofluoric acid is the weakest of all the halogen acids ?

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  15. Which acid is used to draw picture on glass?

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  16. What happens when fluorine is passed through conc. NaOH solution?

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  17. What happens when chlorine gas is passed through cold solution of NaOH...

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  18. Give the reason for bleaching action of Cl(2).

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  19. Name two poisonous gases which can be prepared from chlorine gas.

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  20. What is the role of MnO2 in the preparation of Cl2 from HCI?

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